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https://issues.apache.org/jira/browse/MAHOUT-704?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sebastian Schelter updated MAHOUT-704:
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Description:
The code in org.apache.mahout.cf.taste.hadoop.als.PredictionJob should be
refactored to use org.apache.hadoop.mapreduce.lib.input.MultipleInputs for the
reduce-side joins. This should spare us some M/R cycles and greatly simplify
the code.
We'd need to add another prepareJob() method to AbstractJob in order to make
this work.
This is a rather cosmetic feature request that can wait till after the 0.5
release.
was:
The code in org.apache.mahout.cf.taste.hadoop.als.PredictionJob should be
refactored to use import org.apache.hadoop.mapreduce.lib.input.MultipleInputs
for the reduce side joins. This should spare us some M/R cycles and greatly
simplify the code.
We'd need to add an other prepareJob() method to AbstractJob in order to make
this work.
This is a rather cosmetic feature request that can wait till after the 0.5
release.
> Refactor PredictionJob to use MultipleInputs for reduce side joins
> ------------------------------------------------------------------
>
> Key: MAHOUT-704
> URL: https://issues.apache.org/jira/browse/MAHOUT-704
> Project: Mahout
> Issue Type: Improvement
> Components: Collaborative Filtering
> Affects Versions: 0.6
> Reporter: Sebastian Schelter
> Assignee: Sebastian Schelter
>
> The code in org.apache.mahout.cf.taste.hadoop.als.PredictionJob should be
> refactored to use org.apache.hadoop.mapreduce.lib.input.MultipleInputs for
> the reduce-side joins. This should spare us some M/R cycles and greatly
> simplify the code.
> We'd need to add another prepareJob() method to AbstractJob in order to make
> this work.
> This is a rather cosmetic feature request that can wait till after the 0.5
> release.
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